Adjustable means for automatic controllers for gas water-heaters.



H. JARVIS. ABLE MEANS FOR AUTOMATIC CONTROLLERS FOR GAS WATER HEATERS.

APPLlCATlON HLE'D FEB.2,1917.

ADJUST 1,291,007. Patented Jan, 14, 1919.

Inventor.

@y/MW I W UNITED STATES PATENT OFFICE.

HAROLD JARVIS, OF TORONTO, ONTARIO, CANADA. 7 ADJUSTABLE MEAN S FOR AUTOMATIC CONTROLLERS FOR GAS "WATER- HEATERS. I

Application filed February 2, 1917.

' ject of the King of Great Britain, and resident of the city of Toronto,

rovince of Canada, have invented certain new and use- Improvements in Adjustable Means for Automatic Controllers for Gas Water-Heaters, as described in the following specification and illustrated in the accompanying county of York,

drawings, that form part of the same.

he principal object-of the invention is to allow of an adjustment being made to the gas valve opening and closing means from the exterior of the casing so that the maximum temperature of the supply of hot water in the tank may be controlled.

he principal feature of the invention consists in the novel construction and arrangement of parts, whereby the adjusting screw threaded into the valve operating arm and which rests upon the thermostat is turned to efiect an adjustment by a member rotatably arranged in the casing and inclosing the valve controlling means and extending to the inner side .thereoflthe-inner end having a crank member provided with a pin slidably arranged in a slotted arm secured to the adjusting screw.

In the drawings, Figure 1 is a longitudinal sectional view through a thermostat controller showing my improved adjustment.

Fig. 2 is a perspective detail showing the adjusting members and a part of the casing in section.

Like numerals of reference indicate corresponding parts in the various figures.

he present invention has been devised as a further improvement to my previous United States Patent zit-1,172,459, and has been devised for the purpose of expediting the adjustment of the valve so that the period of operation may be varied according to the particular requirements, that is to say, if it is desired that the gas remain turned on full for a greater period and the temperature of the water thus raised to a higher point the adjustment member may be operated without disconnecting any of the parts.

The casing 1 in which the gas control mechanism is arranged is provided with a thermostat 2 which extends into the water to be heated. The interior of the casing 1 is connected to a suitable gas supply and forms a gas holding chamber. The exit Specification of Letters Patent.

Ontario, in the Dominion of v vlded above the screw Patented Jan. 14, 1919. Serial No. 146,200.

from the gas chamber is through the valve seat 3 and pipe 4 to the burner. This exit is. controlled by a valve 5 carried upon the The pivotal arm 7 is held to a downward position by by the tension spring 9 with a pin 10 secured extending through a hole in the arm 7.

he movement of the arm 7 by the th threaded in 7 he present invention has to do with the adjustment or regulation of the screw 12. In order to accomplish the adjustment of this screw from the exterior of the casing after the device has been assembled and connected with the gas supply, I have pro- 12 a hollow boss 13 through which a spindle 14 extends, said spmdle having a taper surface 14 engaging a taper surface 14.

crank arm 15 is secured to the inner end of the spindle and at its extremity is which is connected provided with a downwardly extending pin An indicating finger 19 is secured to the outer end of the spindle 14 beyond the casmg 1 so that y swinging the indicating finger the spindle .14 will be rotated consequently swinging the pointer and crank arm 15 and causing the arm 18 to be turned to eflectthe rotation of the screw 12. The adjustment is altered in such a manner as to raise or lower the arm 7 in relation to the position of the thermostat, consequently changing the adjustment of the valve carried upon the outer end of the arm 6. A very slight turn of the screw makes a very great difference in the action of the valve, as the screw is arranged very close to the fulcrum of the lever Positive stops to limit the movement of f valve carrying arm arranged within a closed the compression spring Sand I outward end of the arm rigidly secured to said contact, a spindle gas chamber having a threaded contact gas chamber having a threaded adjusting member engaging the thermostat, of a slotted member engaging the thermostat, of a spindle extending through the Wall of the gas chamber and having a taper surface engaging a taper seat in said Wall, a crank secured to the inner end of said spindle, an arm secured to said adjusting member having a slot therein adapted to receive .the pin of the crank arm carried by said spindle, and a pointer handle secured to the upper end of said spindle outside of said casing. HAROLD JARVIS.

extending through the wall of the gas chamber and rotatable therein and having a crank arm adapted to flexibly engage and operate the slotted arm secured to said adjustable member Without binding.

2. In an adjustable means for automatic controllers for gas Water heaters, the combination with a thermostat and a pivotal valve carrying arm arranged Within a closed 

